Honestly, I searched online, but I couldn't find anything close by description. In addition, the correct keywords, for a brief description of the question for the search, cannot be chosen.
Essentially, the challenge is as follows. There is some local area network. There is a head computer on which the teacher runs his presentation. Every computer on the network must be able to connect to this head-end computer (such as a passive terminal) in order to watch the progress of this very presentation controlled from the head-end computer.
Maybe I do not understand something and there is another, more convenient way, but in this case, the technology seems to me to be like that. I tried to use something like remote access to the desktop, but this is not at all that - there are restrictions on the number of connected computers, and it displays everything that happens on the screen of the operator.
I don’t even know how to solve this issue ... The problem is that the equipment is also old — tselerony, ALt-Linux School 4.0.